landfill type aerobic landfill anaerobic sanitary landfill with daily cover improve anaerobic...
TRANSCRIPT
Landfill Type
aerobic landfill anaerobic sanitary landfill with daily
cover improve anaerobic sanitary landfill with
buried leachate collection facilities landfill with forced aeration
Only the anaerobic and semi-aerobic landfill are desirable when leachate and gas quality to be considered
Open dumping
potential source of disease fires are uncontrolled air pollution smell pollute nearby waterways & ground
water ugly scavenging
Sanitary landfill
destruction of habitats - (wetland) cause of urban land shortage hence transportation cost – (distant) lost of resources – cannot be replace leachate leakage - (groundwater
contamination) maintenance after completion require 10
to 15 years Non-available of suitable cover material
Level of Sanitary Landfill
Level 1: control tipping
Level 2: sanitary landfill with bound and daily soil cover
Level 3: sanitary landfill with leachate recirculation
Level 4: sanitary landfill with leachate treatment facilities.
Landfill Technology
The most common landfill technologies are
area method
trench method
ramp method
sandwich method
Area method/Depression
terrain is unsuitable for the excavation of trenches
Solid waste cells constructed in a large area
layers of cells are created until the permitted height reached
Each cell represents the waste received and compacted in place and covered each day.
Can accommodate very large volume operation
Earth dyke with height of one lift (2-3 m) is first constructed to gate the support for compacting.
The wastes are unloaded at the top of the earth dyke and spread and compacted on the slope of the dyke.
The layers dept is from 30 – 60 cm.
Depression method best for area where natural depression exist.
The installation liners and leachate collection system is relative easy.
The earth cover of this system is usually obtain from borrow-pit or brought from elsewhere.
• Area method
Trench Method
Waste is spread and compacted in an excavated trench
The excavator tailings are used as cover material
Best for flat land where the excavation of trenches can be carryout easily.
The ground water level should be sufficiently low
The trench size varies in length and width:
dept: 1 – 2 metre width: 2 – 5 metre length: 30 – 120 metre
Wastes are spread into thin layers from 30 -60 cm and compacted before soil cover in introduced.
• Trench Method
Ramp method
also call progressive slope. A combination of area method and
trench method Solid waste is spread and compacted
on a slope cover material is obtained directly from
the front of the working face. The excavation of cover material
provides a depression for the next day waste.
Ramp is about 15 metre wide and 30 metre length and suitable height.
Trucks come on the top of the ramp and discharge their contents inside the trench.
Sandwich method
Used when the solid waste is deposited horizontally into narrow valleys.
Cover soil layer is added over each layer of solid waste
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